Attrition-mill.



J. S. SORENSEN. ATTRITION MILL.

APPLIOATION r1121) APR. 7, 1911.

Patented Mar. 26, 1912.

4 SHBET8SHEET 1.

COLUMBIA PLANOORAPH CO" WASHINGTON. D. C.

J. s. SORENSBN. ATTRITION MILL.

APPLICATION FILED APR. 7, 1911.

1,021,167. Patented Mar.26, 1912.

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J. S. SORENSEN.

ATTRITION MILL. APPLICATION FILED APR. '1, 1911.

Patented Mar. 26, 1912.

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J. S. SORENSEN. ATTRITION MILL.

APPLICATION IILED APR. 7, 1911. 1,02 1, 1 67. Patented Mar. 26, 1912.

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UNITED STATES PATENT OFFICE.

JOHN S. SORENSEN, .OF MUNCY, PENNSYLVANIA, ASSIGNOR 'I'O SQPROUT, WALDRON & COMPANY, OF MUNCY, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

ATTRITION-MILL.

Specification of Letters Patent.

Application filed April 7, 1911. Serial No. 619,622.

tain new and useful Improvements in Attrition-Mills, of which the following is a specification.

This invention relates to improvements in attrition mills, and has for its object the provision of a mill in which space will be economized and the grain fed to the grinding disks with less choking and in greater quantities than has heretofore been possible.

A further object of the invention is to provide a construction by which the friction between the moving parts will be reduced to a minimum and practically eliminated and the runners rotated at high speed without the application of great power.

Other incidental objects of the invention will appear as the description of the same proceeds, and the invention resides in certain novel features which are first fully described and then more particularly pointed out in the claims at the end of the description.

In the accompanying drawings which fully illustrate my invention, and which are to be taken as a part of this description, Figure 1 is a vertical longitudinal section through the grinding disks, runners, hoppers and the casing inclosing the runners of an attrition mill embodying my present invention. Fig. 2 is an elevation of the feed cylinder showing the arrangement and construction of the runner head in dotted lines. Fig. 3 is a vertical section taken on the line 1 33 of Fig. 1. Fig. 4 is a section taken on the line 44 of Fig. 2. Fig. 5 is a perspective view of the runner head detached from the runner and the hopper. Fig. 6 is a view similar to Fig. 1 showing a modified form of the mill.

In the drawings, 1 denotes the base of the mill upon which are secured pedestals 2 which support bearings 3 in which the runner shafts 4 and 5 are mounted. In the drawings I have shown an arrangement of pedestals and bearings which will form the a subject matter of a separate application and which embody an anti-friction or ball bearing 6 clamped to the runner shafts and capable oflongitudinal movement to follow the adjustment of the said shafts to compensate for wear upon the grinding disks or plates. The runner 7 is shrunk or otherwise rigidly secured upon the shaft 4: and carries the grinding disk or plate 8 in the usual manner and fits within the casing 9 as shown and as will be readily understood.

To guard against leakage around the hub of the runner 7 I secure upon the outer side of the casing. a packing 10 which fits closely to the hub of the runner, so as to prevent the passage of the dust or flour between the hub and the casing.

The feed runner shaft 5 is mounted in the same manner as the runner shaft 4, and has rigidly secured to its inner end a head which, preferably, comprises a disk or circular plate 11, which may be shrunk upon the end of the shaft or otherwise rigidly secured thereto, and a substantially cylindrical cage or head proper indicated at 12. This cage or head 12 is provided with an annular back plate 13 which is secured to the disk or plate 11 by bolts 14 and has an axial flange or annular band 15 as clearly shown. At intervals around this axial flange are formed beaters, scrapers or wipers 16 which extend axially inward and have their inner ends connected by a ring or annular band 17 at the outer edge of which is a radial annular flange 18 through which securing bolts 19 are inserted to secure the said flange and head to the runner 20, as shown. It will thus be seen that there are no radial arms extending across the eye or feed opening through which the grain passes to the runners and the grinding disks, and the end of the head is entirely open so that an unobstructed passage is provided for the grain and consequently it will pass more rapidly than heretofore to the grinding disk and the liability of choking is overcome. It will also be noticed that the construction provides a wide opening for the passage of the grain from the hopper into and through the head, and that the grain passes directly to and through the eye without being first deflected in its passage from the hopper. This unobstructed feeding of the grain will be readily com Patented Mar. 26, 1912.

directly from the hopper to the grinding disks. I am thus enabled to dispense with all feeding screws and similar devices so that the mill may be efficiently operated with less power than has heretofore been required.

The feeders, wipers or scrapers 16 are beveled inwardly upon their longitudinal side faces 21, so that the grain will readily pass over and fall from the same during the rotation of the head and the inner axial longitudinal faces 22 are likewise beveled, inclined or tapered, so that they diverge toward the runner and consequently present a downward incline over which the grain will readily roll to reach the runner, as clearly shown in the lower portion of Fig. 1. On the outer faces of the boaters or feeders 16 are formed longitudinal ribs 23 which will take up any grain which may fall into the trough at the bottom of the spout and lift the same, so that it will drop through the head and then pass into the grinding space together with the main body of the grain.

The spout 24: is bolted directly to the easing 9, and its lower end is clamped to a casing or drum 25 which surrounds the head and constitutes an annular trough in which the wiping or scraping ribs 23 will rotate. The opening 26 in this drum or casing around the head 12 is beveled outwardly toward the runner shaft, as shown at 27, so that the edge of the casing does not come into contact with the head and consequently there is no frictional wear between the head and the casing. Furthermore, any dust or grain which might lodge between the head and the casing is, by this construction, deflected back into the head, so as to pass on through the mill and be ground. In order to prevent the access of outside dust and dirt to the interior of the mill through this opening, I secure upon the outer side of the casing cover plates 28 which fit closely to the head without actually touching the same and which are of thin hard steel, so that while they will efliectually close the opening to any outside substances they will not bind upon the runner head so as to impede its rotation or cause excessive wear of the same. In order to compensate for any slight wear which may come upon the edges of these plates through long continued use and the collection of grain against them, I secure the plates to the casing by bolts 29 passing through slots 30 in the plates, which are disposed so that the plates may be readily moved up to the head and thereby maintain the necessary close relation therewith. The opening in the easing 9 through which the runner plays is also beveled, as shown at 31, and cover plates 32 are secured upon the face of the casing so as to extend over the said opening and inclose the runner head in exactly the same manner as the plates 28 inclose the same.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the operation of my invention and the manifold advantages of the same will be readily comprehended and ap preciated.

As before stated, the construction of the head entirely overcomes the provision of radial arms extending from the shaft to the runner, as has heretofore been the common practice, and as this former practice re quired the passage of the end of the shaft through the head and close to the opposed runner, the space for the passage of the grain to the runners was necessarily very restricted. By my present invention, the entire interior of the head is left open and the end of the shaft terminates at the back of the head. The blades or beaters 16 have only sufficient thickness to connect the bands 15 and 17 securely and do not interrupt the fall of the grain into and through the head. By referring to Figs. 3 and 4: more particularly, it will be noticed that there is no obstruction to the lower end or mouth of the spout, except when one of the beaters happens to be at the highest point of the head. As this position occurs for only a trifling period of time during the rotation of the head, it is obvious that the passage of the grain from the spout through the head and eye to the grinding plates is free and unobstructed so that the flow of the grain may be rapid and continuous and a greater quantity ground in a given time than has heretofore been possible without burning the grain or causing excessive wear and strain on the mill.

As shown in Figs. 1 and 3, the ribs 28 fit within the trough presented by the casing 25, so that they act as scrapers to take up any grain which may pass through the head and tend tocollect in the bottom of the said trough and, consequently, there is no waste of grain in the use of my present mill. These ribs or scrapers will fit within the trough so closely as to prevent the packing of the grain in the bottom of the same, and at the same time will be out of actual contact with the walls of the trough, so that there will be no frictional wear between the trough and the head. The accumulation of grain in and around the head is also thus overcome, so that the frictional resistance upon the parts of the head and the elements surrounding the same due to choking of the grain is entirely overcome and the power re quired to drive the mill reduced to a minimum. It will also be particularly noticed that the sealing rings heretofore employed between the runner and the casing are entirely eliminated by my present invention,

-so that the frictional resistance between these parts is no longer an element of consideration and stoppage in the mill and delay in the grinding processes due to the wearing and replacing of these seal rings is avoided. By doing away with the seal rings, I am enabled to arrange the parts of the mill more compactly inasn'zuch as the runner may be brought closer to the side of the casing and the spout and head may be enlarged, so as to extend to the bearing or support for the runner shaft and stability of the mill is thus secured, inasmuch as the shaft may be mounted in fixed bearings be cause it will not be necessary to adjust the said shaft longitudinally as heretofore, for the purpose of taking up the wear upon the seal rings. For the stated reasons, it will. be seen that I have provided a mill which may be operated at a high speed continuously and without any incidental stoppages or delays, and will act upon a large quantity of grain rapidly and effectually.

In Fig. 6 I have shown a form of the mill in which the axial flange 15 is dispensed with, and the back plate 13 and the disk 11, to which it is secured, are arranged in the plane of the outer wall of the spout thereby effecting an economy of space. The outer edge of the back plate is rounded off, as shown at 33, so that there will be practically no surface on which grain may collect around the head to interfere with or retard its rotation. The ribs 23, in this form of the mill, have outwardly converging ends 34 so that they may fit closely within the beveled openings 25 and 31' of the casing and spout, thereby effectually wiping from the trough formed by the spout all grain which may tend to collect therein. In this form of the mill, furthermore, the band 17 is flared toward the runner so as to present an inclined surface to the travel of the grain and thereby facilitate the passage of the same to the grinding plates. To further aid in feeding the grain to the grinding plates, the runner shaft is projected slightly into the head or feeding space and the disk 11 is provided with a conical hub 35 extending to the end of the shaft. The falling grain will strike this conical hub and will be thereby deflected toward the runners.

Other modifications may be made in the details of construction without departing from the invention as the same is defined in the following claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A runner head for attrition mills having an open unobstructed eye in one end and having receiving openings in its side, substantially as and for the purposes set forth.

2. A runner head for attrition mills consisting essentially of a pair of annular bands having a common axis and spaced apart along said axis, and feeders connecting said bands and disposed. substantially parallel with the axis thereof.

3. A runner head for attrition mills consisting essentially of apair of annular-bands spaced apart along a common axis, and feeders extending substantially parallel with the axis of and connecting said bands, said feeders being beveled on their inneropposed faces whereby said faces diverge toward one of the bands.

at. A runner head for attrition mills consisting essentially of a pair of annular bands spaced apart along a common axis, and feeders extending substantially parallel with the axis of and connecting said bands, said feeders havin their side faces beveled to converge inwardly.

A runner head for attrition mills comprising a pair of annular bands spaced apart along a common axis, and feeders disposed substantially parallel. with the axis of said bands to extend between and connect the same, said feeders having their inner opposed faces beveled to diverge toward one of the bands and the side faces of each feeder being beveled to converge inwardly.

6. In an attrition mill, the combination with a spout, of a hollow runner head extending across the spout and rotatable in the opposite sides thereof, said hollow head having one end open and having openings in its side arranged to register with the interior of the spout and receive material therefrom as the head rotates.

7. In an attrition mill, the combination with a runner, and a casing inclosing the same, of a spout secured on the side of the casing, a runner shaft, and a runner head carried by the end of said shaft and extending through and across the spout, said runner head having an open unobstructed inner end secured to the runner and having feed openings in its side registering with the spout.

8. The combination of a casing, a runner within the casing, and a runner head having open sides and rotatably mounted in and extending across the casing and provided at its inner end with an annular radial flange secured directly to the runner.

9. In an attrition mill, the combination with a spout, of a hollow runner head extending through the spout, external circumferentially spaced scrapers disposed longitudinally on the runner head and extending uninterruptedly to and-between the end walls of the spout to sweep the contents of the spout into the head, and a runner secured to the inner end of the head.

10. The combination with a casing, of a runner head extending through the casing and comprising spaced longitudinal feeders connecting the ends of the head, one end of the head being closed and the opposite end open, a runner shaft secured in the closed end of the head, and a runner secured to the open end of the head.

11. The combination with a casing, of a runner therein, and a runner head rotatably mounted in the side of the casing and having an annular end portion secured to the runner, the said annular end portion bridging the space between the runner and the side of the casing.

12. The combination of a spout provided in both its sides with openings beveled outwardly toward their centers, a hollow runner head extending across the spout and mounted to rotate in both said openings out of contact with the edges thereof and having an open end adjacent one side of the spout, and a runner secured to said open end of the head.

13. The combination with a spout having alined openings in its opposite sides, said openings having outwardly beveled walls, of a runner head extending across the spout and rotatable in said openings, and external scrapers on the head extending across the spout and terminating at said openings.

14. The combination with a spout having alined openings in its opposite sides, said openings having outwardly beveled walls, of a runner head extending across the spout and rotatable in said openings, said runner head having circumferentially spaced axially extending feeders, and external scrapers on said feeders extending across the spout and terminating at said openings.

15.. The combination with a casing, of a runner head mounted to rotate in said casing and comprising circumferentially spaced axially extending feeders, and scrapers carried externally by said feeders.

16. The combination with a runner, and a runner shaft, of a plurality of annularly spaced longitudinally extending feeders, connected at their inner ends with the runner and at their outer ends with the shaft.

17. The combination with a runner, and a runner shaft, of a plurality of annularly spaced longitudinally extending feeders connected at their inner ends with the runner and at their outer ends with the shaft, the ends of the shaft projecting inward beyond the outer ends of the feeders, and a conical deflector on the projecting end of the shaft.

In testimony whereof I aflix my signature, in presence of two witnesses.

JOHN S. SOREN SEN.

Witnesses:

STEPHEN SOARS, J. RUSSELL SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

